I imagine Mike is right. I do try to clean up the map periodically, and I’ve even found Ben’s marker dragged to the wrong place in the past. The markers that get dragged out into the ocean are easy to see, but the one’s like you just pointed out are harder to find. Thanks for mentioning them. I just dragged them back close to where they should be.
I also delete markers that get placed but don’t have a name associated with them, so if any of you placed a marker and don’t see it now, it’s because it was generically named “Placemark” and I assumed it was created by accident.